I want print normal letter, but inkt manager says that inkt is runout. I checked the inktanks and they all give ink. Is there a other thing I should check??I want print normal letter, but inkt manager says that inkt is runout. I checked the inktanks and they all give ink. Is there a other thing I should check??

If printing from MS Windoze, then when you select printer from your application, select properties button, then on that page will be a checkbox for "Grayscale Printing" ,check it and you are good to go. You will probably have to do this for each print job you send.

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You may have blocked nozzles in the black print head. Try the printer maintenance to clear the printer nozzles. After several deep cleaning attempts and there is no improvements in the print then a new print head is required. A new print head maybe expensive and it maybe more cost effective to purchase a new printer.

The Grayscale print option optimizes the look of color slides for printing on a black and white printer by adding shading. The Pure Black and White option prints your slides in monochrome.

Open the presentation you want to print.

Click on the word File in the Menu Bar.

Select the option Print.

The Print dialog will appear.

example:
5.In the Color/Grayscale section, choose the Grayscale option to print in black, white, and shades of gray.
6.Choose the Pure Black and White option to print in black and white only.
7.Click on the OK button.

If your background is "Black" it's going to print it all black, change your background color to "Gray" and your machine will then print a gray background instead of black. Also note that when you print a black background your toner life expectancy will be no where your expected yield ratio is. Average yield is 5% for X (X meaning size of cartridge) amount of printed pages. If your printing a black background your utilizing 100% yield coverage. Not sure if this is the answer your looking for. However basic black and white printing with a black background will print the page completely black.

Run the PQ troubleshooting diagnostic.See if the black is printing.If not, run the Disable Cartridge check. This will allow you print with only one cartridge in the printer. Take out all the cartridges. Put the black in another slot and put the cyan in the black slot(the top). Print the config page. If the black is printing, is the cyan printing. If black isn't printing the cartridge is bad. If black is printing and cyan isn't something is wrong with the printer. If they are both printing put them back in the correct locations along with the other two colors. It isn't the printer.

According to canon.com's website regarding the i9900 InkJet Photo Printer:

Why color ink may be used when printing in black and white
Even when printing in black and white, color ink is used for the following reasons:

Automatic cleaning of the print head.

To prevent the print head nozzles from clogging, the print head is automatically cleaned periodically. At that time, a small amount of each color ink is consumed.

Therefore, although printing in black and white is performed, color ink is also consumed.

Color inks may be used to create black.

When printing in grayscale or on photo paper or when duplex printing, although printing appears in black and white, the color black may be created using the three (cyan, magenta, and yellow) color inks. Printers without a pigment black tank / cartridge will print black / grayscale will create a composite black using color ink even on plain paper.

Therefore, although printing in black and white is performed, color ink may be consumed.

In order to keep the heavy black ink from smearing on the page or in the printer, color ink is used when duplex printing to help create black text.

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I might suggest taking out the color ink cartridges leaving only black there, but some printers don't take kindly to this. So, you may have to further experiment with magenta, cyan, and yellow to make it at least seem b&w to your best eye's judgment.

It is a little known fact that ink cartridges do have an expiry date, and it is sometimes possible that even if a printer reads full, that it has dried out and will not print. When you recieve a warning that your ink is too low you will simply be unable to print black ink after a certain point. Generaly if you want to print in only black you will have to do that when you print a document. For instance in IE when you go to file and then print you can select prefrences and select print in greyscale or black. hope this helps!

I found a solution to the Black printing problem :)
Under Printing Preferences: Set your Media Type to Photo Paper Pro.
We used edible ink cartridges and printed onto icing sugar paper. Same old... Just one day it refused to print black. In order to continue our small business, I degraded the color until I printed gray and not black.